Candidate Work-around:

For the case of disabling swap, I was able to eliminate the boot-time
error with the following actions:

Remove swap line from /etc/fstab
Remove swap line from /etc/crypttab
Remove /swapfile
apt purge cryptsetup
apt autoremove (clean up cryptsetup dependencies)

The updates to /etc/fstab and /etc/crypttab were not enough to eliminate
the error message at boot. It seems cryptsetup was still doing something
in the boot sequence that caused it to try and create an encrypted swap
file. Purging the cryptsetup package was necessary to eliminate the
error message. Therefore, this issue may be relevant to both the Ubuntu
upgrade process and the cryptsetup package.

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https://bugs.launchpad.net/bugs/1802617

Title:
  After upgrade to 18.10 boot fails on waiting for encrypted source
  device

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